!-------------------------------------------------------------LICENSE--------------------------------------------------------------!
!                                                                                                                                  !
!The MAP code is written in Fortran language for magnetohydrodynamics (MHD) calculation with the adaptive mesh refinement (AMR)    !
!and Message Passing Interface (MPI) parallelization.                                                                              !
!                                                                                                                                  !
!Copyright (C) 2012                                                                                                                !
!Ronglin Jiang                                                                                                                     !
!rljiang@ssc.net.cn                                                                                                                !
!585 Guoshoujing Road. Pudong, Shanghai, P.R.C. 201203                                                                             !
!                                                                                                                                  !
!This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License         !
!as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.             !
!                                                                                                                                  !
!This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of    !
!MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.                        !
!                                                                                                                                  !
!You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software     !
!Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.                                                   !
!                                                                                                                                  !
!-------------------------------------------------------------LICENSE--------------------------------------------------------------!

!==================================================================================================================================|
subroutine model_variables (ro, mx, my, mz, bx, by, bz, en, gx, gy, po, x, y, nx, ny)
!==================================================================================================================================|

   use parameters
   implicit none

   integer(4), intent(in) :: nx, ny

   real(8), dimension(nx), intent(in) :: x
   real(8), dimension(ny), intent(in) :: y
   real(8), dimension(nx, ny), intent(inout) :: ro, mx, my, mz, bx, by, bz, en, gx, gy, po

   integer(4) :: i, j
   real(8) :: pr

!----------------------------------------------------------------------------------------------------------------------------------|
!  Shock tube
!----------------------------------------------------------------------------------------------------------------------------------|
   do j = 1, ny
   do i = 1, nx

!      if (x(i) .lt. 0) then
!         ro(i, j) = 1.0d0
!         mx(i, j) = 0.0d0
!         my(i, j) = 0.0d0
!         mz(i, j) = 0.0d0
!         bx(i, j) = 0.75d0
!         by(i, j) = 1.0d0
!         bz(i, j) = 0.0d0
!         pr = 1.0d0
!      else
!         ro(i, j) = 0.125d0
!         mx(i, j) = 0.000d0
!         my(i, j) = 0.0d0
!         mz(i, j) = 0.0d0
!         bx(i, j) = 0.75d0
!         by(i, j) = -1.0d0
!         bz(i, j) = 0.0d0
!         pr = 0.1d0
!      endif

      if (y(j) .lt. 0) then
         ro(i, j) = 1.0d0
         mx(i, j) = 0.0d0
         my(i, j) = 0.0d0
         mz(i, j) = 0.0d0
         bx(i, j) = 1.0d0
         by(i, j) = 0.75d0
         bz(i, j) = 0.0d0
         pr = 1.0d0
      else
         ro(i, j) = 0.125d0
         mx(i, j) = 0.000d0
         my(i, j) = 0.0d0
         mz(i, j) = 0.0d0
         bx(i, j) = -1.0d0
         by(i, j) = 0.75d0
         bz(i, j) = 0.0d0
         pr = 0.1d0
      endif

      en(i, j) = pr / gmm1 + (mx(i, j) * mx(i, j) + my(i, j) * my(i, j) + mz(i, j) * mz(i, j)) / ro(i, j) / 2.0d0 +                &
         (bx(i, j) * bx(i, j) + by(i, j) * by(i, j) + bz(i, j) * bz(i, j)) / 2.0d0

      gx(i, j) = 0.0d0
      gy(i, j) = 0.0d0

      po(i, j) = 0.0d0

   enddo
   enddo

!----------------------------------------------------------------------------------------------------------------------------------|
end subroutine model_variables
